of highland park



' Reissued Sept. 25, 1923.

UNITED STATES PATENT err-ice- CARL PFANSTIEHL, OF HIGHLAND PARK, ILLINOIS, ASSIGNOR TO SPECIAL CHEMICALS column, or .HIGHLAND ranx,

ILLINOIS, A CORPORATION 01! ILLINOIS.

v TOOTH-CLEANING PREPARATION. I

No Drawing. Original To all 'ZI /l-U'II'I, it may concern.'- 2 Be it known that I, Cam. PFANSTIEHL, a

citizen of the United States, residing at lactone is highly eflicacious as a solvent for the organic binder or matrix of tartar and, by a large number of experiments under my direction, it has been found that this ma terial is without action uponthe enamel of the teeth and that it exercises a stimulating action upon the gums. I have discovered that other members of the same class of compounds (which ma be designated as poten-' tial acids in that t ey tend to form the corresponding acids in aqueous solution until an equilibrium between the potential acid and the corresponding acid is reached), of which the lactones of the sugar acids and particularly the lacton'es of the hexonic acids are examples, possess the same properties. Other suitable compounds of this class are, for example, mannoniclactone and gluconic lactone.

I have discovered that when these lactones are incorporated in pastes, powders and like compositions of the character hitherto known for general use as tooth-cleaning preparations, the lactone rapidly loses its activity and in many cases forms hard cement-like masses, These deleterious effects take place even when no water is employed as such in the vehicle in the case of pastes and they likewise occur in the case of powders containing the customary abradents and flavoring constituents, with or without sap'cnaceous constituents.

In accordance with the present invention a substantially permanently active preparation containing the lactone maybe prepared by intimately admixing the lactone with fillers whichhave been substantially completely dehydrated and in the case of a paste, employing a vehicle which is substantially anhydrous. The following examples illustrate the present invention.

No. 1,445,351, dated February 13, 1923, Serial Ro. 504,144, filed September 1921. Application for reissue filed August 16, 1923. Serial No. 657,838.

tains up to 5% 'may be dissolved in the vehicle,

Precipitated chalk, which normally conof moisture, is dried in a vacuum oven until substa'nt1ally anhydrous.

, Suitable flavoring substances, such as' oil of eucalyptus, oil of Wintergreen, thymol, saccharine. etc., areincorporated into it. 2 to 10% of a lactone of a sugar acid, for example, galactonic or mannonic lactone, is then added and thoroughly admixed. The powdered preparation-may be employed as such, or may be formed into a paste by means of an anhydrous massing fluid, preferably comprising anhydrous glycerol (containing not more than 2% moisture) with or without absolute alcohol. Glycerol alone or equal parts of glycerol and alcohol may suitably e employed, the proportion of massing lluid and solids being equal in the above case. A small proportion, say '1 to of gelatine if desired.

If desired, other fillers may be substituted in whole or in part for the chalk. Thus tricalcium phosphate (previously dehydrated) or other inert substance such as kieselguhr may be substituted in the filler in wholeor in part for chalk, or soap powder or saponin may be added. Soap powder, which ordinarily contains 10% or more moisture, must be heated in a vacuum oven to substantially complete freedom from water before use. lVhen the soap is employed in the case of a paste the proportion of vehicle is reduced, and the proportion of alcohol to glyderine in the vehicle may likewise be reduced. The

hydrous massing vehicle and a lactone of a sugar acid.

3. In a tooth cleaning compound, a substantially anhydrous filler comprising precipitated chalk, and galactonic lactone.

4. In a tooth cleaning paste, a substam tially anhydrous filler comprising precipitated chalk, anhydrous glycerine, absolute alcohol and galactonic lactone'. I 5. In a tooth cleaning compound, a'substantially anhydrous filler and galactonic lactone to the amount of 2 to 10% of the total 'solids. l

6. Ina tooth tially anhydrous cleaning paste, a substan total solids. filler, a substantially anhydrous massing vehicle and galactonic lactone to the amountof 2 to 10% of the 'total solids.

7.In a tooth cleaning paste; a substan-- tially' anhydrous filler, a substantially anhydrous massing vehicle and a lactone of a sugar acid to the amountof 2 to 10% of the CARL PFANSTIEHL. r 

